Any flashy sudden burst of a large number of shiny white particles with tails that is so amazing that it draws its viewer to the edge of an orgasm just by watching.
AKA, Ahwatukee third of july fireworks show 2005
by David and Heather July 03, 2005
A hot bitch that is so hot she is worth jizzing on.
Tonya is so hot she is spermtastic!
by G-RED October 29, 2006
A word used to describe a very attractive chick; Like saying she worth all my Sperms.
<Person1> Oh dude, did you see that chick?
<Person2> Yeah, what's with that chick?
<person1> She's spermtastic.
by TroHax January 22, 2008

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